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Method and Related System of Using Crankcase Pressure To Detect Pre-Ignition In Spark Ignition Engine

Abstract: 

Methods and a related system of preventing a pre-ignition event in a spark ignition engine. Unusual crankcase pressure fluctuations often occur prior to a Low-Speed Pre-Ignition (LSPI) event. A high speed high resolution pressure transducer (60) attached to the crankcase (30) of an engine (10) takes a plurality of engine crankcase pressure measurements and relays these measurements to an engine control module (70). The pressure measurements are analyzed to determine if unusual pressure fluctuations within the crankcase are occurring. If so, one or more engine control parameters are adjusted in order to mitigate a LSPI event. Various engine control parameters may be adjusted including fuel injection, engine load and combustion timing.

Patent Number: 
9,080,521
Date Of Issue: 
07/14/2015
Inventors: 

Manfred Amann; Terrence F. Alger II